Then, enter the details for you new GWT 2.3 project. Don’t forget that the property for ‘module’ should be a valid Java Class name, so use camel case when setting the name of module.
My configurations are something like:

Now you have a GWT 2.3 project with GIN 1.5 and Maven.
To finalize, let just remind how to setup GIN with the GWT project.
Generate the eclipse project:

mvn eclipse:eclipse gwt:eclipse

Open the project in eclipse and edit the *.gwt.xml (in my case, this is the file Quickstart.gwt.xml) file, located under “src/main/resources/” to import the GIN module:

<inherits name="com.google.gwt.inject.Inject" />

Create the GinModule, the class file that will configure the dependency injection for your application. You can have any number of GinModules. Check the documentation here: http://code.google.com/p/google-gin/wiki/GinTutorial
I like to keep everything related to GIn under the package *.client.gin. My Module is this: